Corrosion inhibiting vessel construction



5 Q. 5 i 5 52 g hill. V E:

1953 L. w. WILLIAMS 2,638,338

CORROSION INHIBITING VESSEL CONSTRUCTION Filed Nov. 18, 1948 PatentedMay 12, 1953 CORROSION INHIBITING VESSEL CONSTRUCTION Leonard W.Williams, Birchrunville, Pa., assignor to Lukens Steel Company,Coatesville, Pa., a corporation of Pennsylvania Application November 18,1948, Serial No. 60,712

4 Claims.

This invention relates to an improved construction for vessels and isdirected particularly to means for reducing corrosion of melting potsand heat treating bath containers. The construction is alsoadvantageously used on vessels for chemical processes and storage tanksfor corrosive liquids.

The repair or replacement of the above types of vessels has been foundto be an expensive procedure, both from the standpoint of cost of thereplacement as well as the loss of time involved in effecting therepairs. The present invention reduces corrosive action on the walls ofthe melting vessel to a minimum and also includes the provision ofstructure in which any corrosive action that takes place affects only apart that may be renewed without disturbing the entire vessel.

A primary object of the invention therefore, is to provide a rigidlining for a vessel in which the corrosive liquid may be maintained at ahigher level between the lining and the walls of the vessel than mayalways be the case in the body of the vessel proper.

A further object of the invention is to provide a lined vesselconstruction in which all parts subject to corrosive action may bereadily and inexpensively replaced without renewing the body of thevessel.

Further objects will be apparent from the specification and drawings inwhich:

This vessel may be fabricated from any metal or combination of metals.

Fig. l is a sectional view showing an enclosed pressure kettleconstructed in accordance with the invention;

Fig. 2 is a fragmentary sectional view similar to Fig. 1, showing amodified support for the liner;

Fig. 3 is a fragmentary sectional view illustrating the invention asapplied to a melting pot; and

Fig. 4 is a transverse sectional view as seen at 5-4 of Fig. l.

The kettle comprises a lower body 5. The rim of body 5 has an annularflange 6 welded or cast thereto, the flange being adapted to receive acover 1 having a cooperating flange 8. When the cover is in the closedposition of Fig. l, a tight seal is provided by means of bolts 9, 9. Theinside of cover 1 has an annular rim welded or cast around the innercircumference thereof and somewhat above the lower edge of the cover.Rim I0 is adapted to support a sleeve-like liner II which is flared atl2 and bolted to rim In by means of cap screws l3, l3. Liner ll extendsdown into body and may, if desired, have radially 2 extending feet l4,14 adapted to space the liner from the inside wall of body 5. The linerII terminates above the bottom of body 5 so that there will be freefluid passage around the bottom of the liner into the annular space l5between the liner and the walls of body 5.

Liquid I6 is introduced into the kettle through any convenient conduit(not shown) and the liquid level is raised until annular space 15 hasbeen substantially filled. Pipe l1 and valve l8 provide a suitable ventfor this purpose. When space I5 is filled, valve I8 is closed manually,or automatically in the event that it be a check valve, and the kettleis then ready for use. The corrosive action that may occur on the wallsof the vessel is restricted to the inner surface of cover I, the topface of flange l0, and the inside surface of liner II as shown inFig. 1. It is well known that the corrosive action that is most harmfulto the walls of the kettle takes place in the presence of air or asimilar oxidizing gas so that by confining the air space to the coverand to the liner, or by producing a non-oxidizing condition in the spacebetween the liner and the shell, it is possible to prolong the life ofthe body of the kettle more or less indefinitely.

The construction is also adapted to the introduction of an inert gasthrough conduit I! after all the air has been exhausted in the eventthat the size or other features render this expedient desirable. Legs l4serve to position the liner in place at all times, thus preventing anyrestriction of the free liquid flow around the bottom of the liner 1 I.It will be noted in the construction of Fig. 1 that the cover I may bequickly removed from body 5 by disconnecting bolts 9. In addition, theliner l I may be removed from the cover by means of cap screws 13 sothat it is not always necessary to replace both the liner and the cover.

The embodiment of Fig. 2 contemplates an integral welded or castconstruction for the liner and the cover, and shows the liner l I weldedor cast to the underside of rim 10 rather than removably attachedthereto.

Fig. 3 illustrates a modification which is primarily adapted for openvessels such as melting pots or heat treating baths and contemplates theintroduction of an inert non-oxidizing gas to the annular space betweenthe wall of the pot body 20 and the liner 2 I. It will be understoodthat the precise construction and manner of use is dependent on theoperating conditions, the material to be used in construction, and uponthe cost of replacing the vessel, as well as the cost of supplying aninert gas to the body. In the structure of Fig. 3 for example, I havefound that greatly improved results can be obtained simply by the use ofa check valve 22 in conduit 23. When the pot body 20 is filled withliquid, air between the liner 2! and the body is automatically expelledfrom conduit 23. Check valve 22 prevents air from re-entering the spacebetween the body 20 and the liner 2 l. The small quantity of oxygenremaining between the liner and the body is frequently insufficient tocause serious corrosion, or may be absorbed by the liquid itself. Thus,even the relatively simple construction of Fig. 3 greatly prolongs thelife of a melting pot.

Additional cause for frequent replacement of vessels such as describedherein, comes from erosion of the walls due to the frequent rise andfall of the liquid in the body. By providing a sealed annular chamberbetween the liner and the wall, I greatly reduce the area over whichthis erosion takes place or alternatively, in the forms of Figs. 1 and2, I confine the erosion to a relatively simple and inexpensive part toreplace.

Having thus described my invention, I claim:

I claim:

1. A high temperature vessel comprising a liquid'containlng body member;a lid for said body member, means for securing the lid to the bodymember in liquid and pressure-tight sealing relation thereto, an annularrigid liner depending from and secured to the interior of said lid. theoutside of said liner being circular and of substantially smallerdiameter than the inside of the body member, to provide a smooth annularconcentric space between the liner and the body member, and a vent forthe gas entrapped in the annular space between the liner and the bodymember.

2. Apparatus in accordance with claim 1, in which the liner isdetachably secured to the lid.

3. Apparatus in accordance with claim 1, in which the liner is formedintegrally with the inside of the lid.

4. A high temperature vessel comprising a liquid containing body member;a lid for said body member, means for securing the lid to the bodymember in liquid and pressure-tight sealing relation thereto, a rigidbottomless liner for said body member, all points on the periphery ofsaid liner being substantially equidistant from the walls of the bodymember to provide a smooth space between the liner and the body member,said liner being substantially co-extensive with the vertical walls ofthe body member but terminating above the bottom of the body member adistance sufiicient to provide unrestricted liquid flow between saidsmooth space and the interior of the liner, a pressure-tight rigidconnection between the top of the liner and the top of the body member,and means for preventing radial expansion of the liner with respect tothe body member including a plurality of radially extending legs securedto the outer periphery of the liner and positioned to abut the innerwall of the body member.

LE ONARD W. WILLIAMS.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 323,607 Terhune Aug. 4, 1885 336,076 Ball Feb. 16, 18861,275,196 Aramaki Aug. 13, 1918 1,573,535 Bellis et a1. Feb. 16, 19261,741,104: Friedman Dec. 24, 1929 1,774,276 Kania Aug. 26, 19301,983,118 Bourquc Dec. 4, 1934 2,022,372 Hopkins Nov. 26, 1935 2,404,418Walker July 23, 1946 2,422,070 Bettencourt June 10, 1947 FOREIGN PATENTSNumber Country Date 13,066 Great Britain of 1850 901,422 France Nov. 6,1944

